There are several reasons why Drupal 9 is better than Drupal 7:

1. Security: Drupal 9 has improved security features, such as enhanced password hashing and a stricter requirements for third-party modules. This helps protect your website from vulnerabilities and attacks.

2. Performance: Drupal 9 has a faster and more efficient codebase, which leads to improved website performance and faster page load times.

3. User experience: Drupal 9 has a modern and user-friendly interface, which makes it easier for users to navigate and interact with the website.

4. Accessibility: Drupal 9 has improved accessibility features, including support for screen readers and better support for people with disabilities.

5. Compatibility: Drupal 9 is designed to work with modern technologies, such as PHP 7.4 and Twig 2.0. This ensures that your website is compatible with the latest technologies and will remain up-to-date in the future.

6. Support: Drupal 7 reached its end-of-life in November 2021, meaning it will no longer receive security updates or support from the Drupal community. Drupal 9, on the other hand, will continue to receive updates and support for the foreseeable future.